morbific vs sickening

morbific

adj
  • That causes disease; sickening, pathogenic. 

  • Pertaining to or caused by disease; diseased. 

sickening

adj
  • Causing sickness or disgust. 

  • Amazing, fantastic. 

noun
  • The act of making somebody sick. 

How often have the words morbific and sickening occurred in a corpus of books? (source: Google Ngram Viewer )